4 4 16
0 0 1
0 1 2
0 2 3
0 3 4
1 0 5
1 1 6
1 2 7
1 3 8
2 0 9
2 1 10
2 2 11
2 3 12
3 0 13
3 1 14
3 2 15
3 3 16
